Re: [Amc-list] WHat year 258's get water intake? Real world advantage?

[Frank Swygert <farna@xxxxxxx>]

Yeah, those "wedges" are also what sort of screws up a twin carb setup. I placed the carbs so that 2/3 was over the port "in front of" the wedge, 1/3 "behind the wedge". That was the best I could do, and from looking at the old Offy dual carb plate they were thinking the same. The fact is the engine just doesn't flow enough for placement to make that much difference, but you do need the carbs mostly in front of the simaesed center ports so they get enough mixture. 

I think you're right on the even mixture though. It only works right on the 4.0L because there's an injector at each port. The "trough" intakes are evenly heated and have to be good for economy if nothing else, but I think the heat increasing vaporization evens out the mixture better, even if you do lose a little power in the process. Can't have everything, EVERYTHING is a compromise in one way or another! 

----------------
Date: Wed, 4 Mar 2009 13:08:30 -0800
From: tom jennings <tomj@xxxxxxx>

Just today, I paid attention to a detail cast into the trough, take a look:

http://wps.com/AMC/1963-Rambler-American/Intake/images/intake-trough.jpg

Note the "anti-reversion"  wedges! It's right over intakes for 2-3 and
4-5. (1 and 6 intakes are at the far end of the trough). More Nash
tweaking to a venerable design. I wonder if any of Nash's other sixes
got that.

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

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